Headcanon (AU and Canon-verse): Sasuke suffers from migraines, as he is often not sleeping enough hours at night and is under emotional stress and fatigue. Although he doesn’t like to make a big deal about them, if he pushes himself too hard he will end up with terrible nausea, and can sometimes vomit.
Whenever Naruto is around and Sasuke has a migraine, the blonde immediately helps Sasuke to his room, and closes all the curtains and blinds to prevent any bright light from seeping through. He makes sure the TV and any music is turned off, and closes Sasuke’s door. Then, he sits down on the bed next to Sasuke, who after taking his medicine silently rests his head on Naruto’s lap and tries to rest. When he is having a particularly bad migraine, Naruto will stroke his hair and rub softly around his temples. Most of the time ends up with Sasuke falling asleep, and Naruto stays with him until he wakes up. This is one of the rare times Naruto is quiet, and calm.